diff --git a/src/proto/colors.rs b/src/proto/colors.rs
index f86548c..6ffb492 100644
--- a/src/proto/colors.rs
+++ b/src/proto/colors.rs
@@ -102,10 +102,10 @@ impl FormattedStringExt for str {
 
 impl FormattedStringExt for String {
     fn is_formatted(&self) -> bool {
-        (&self[..]).is_formatted()
+        (&self).is_formatted()
     }
     fn strip_formatting(&self) -> Cow<str> {
-        (&self[..]).strip_formatting()
+        (&self).strip_formatting()
     }
 }
 
@@ -160,4 +160,4 @@ mod test {
     fn test_strip_string_with_digit_after_2digit_color() {
         assert_eq!("\x031212\x031111\x031010".strip_formatting(), "121110");
     }
-}
\ No newline at end of file
+}